Hi anybody have any idea what this might be? 125 gallon with live rock. Lost some fish a few weeks ago, didn't see anything on the fish and the water tested ok. But most of the fish were breathing hard and either at the top or bottom. I assumed flukes so I treated with prazipro(and metroplex) and few times and the fish that made it seemed to be better. So after a couple of weeks I added a few new fish and they've all died within 48 hours and now the fish I've had are breathing hard again. Did the flukes maybe come back? Does anyone know something that works better than prazipro?